Panasonic CS-E12QB4RW, Service Manual

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13.2 Protection Control For Cooling & Soft Dry Operation
13.2.1 Outdoor Air Temperature Control

The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.

This control will begin 1 minute after the compressor starts.

Compressor frequency will adjust base on outdoor air temperature.
13.2.2 Cooling Overload Control

Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation
frequency).

The compressor stop if outdoor pipe temperature exceeds 63°C.

If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise
protection).
13.2.3 Freeze Prevention Control 1

When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stop
operating.

Compressor will resume its operation after stop for 3 minutes and the indoor heat exchanger is higher than 5°C.

At the same time, indoor fan speed will be higher than during its normal operation.

If indoor heat exchanger temperature is higher than 13°C, the fan speed will return to its normal operation.
13.2.4 Freeze Prevention Control 2

Control start conditions
o
During Cooling operation and soft dry operation
 During thermo OFF condition, indoor intake temperature is less than 10°C or
 Compressor stops for freeze prevention control
o
Either one of the conditions above occurs 5 times in 40 minutes.

Control contents
o
Operation stops
o
Timer LED blinks and “H99” indicated
13.2.5 Dew Prevention Control 1

To prevent dew formation at indoor unit discharge area.

This control will be activated if:
o
Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled.
o
When Cooling or Dry mode is operated more than 20 minutes or more.

This control stopped if:
o
Compressor stopped.
o
Remote control setting changed (fan speed / temperature).
o
Outdoor air temperature and indoor intake temperature changed.

Fan speed will be adjusted accordingly in this control.